{"calculation_version":"2026-10-10.1","forecast_source":"history","night_date":"2026-09-02","schedule":[{"end":"2026-09-03T03:50Z","end_local":"06:50","hours":11.0,"mean_quality":0.0,"start":"2026-09-02T16:50Z","start_local":"19:50","target":null}],"targets":[{"best_window":null,"dec":24.11388889,"moon_separation":7.7,"name":"M45","quality_hours":0.02,"ra":56.60083333,"resolved":{"common_name":"Seven Sisters","dec":24.11388889,"name":"Cl Melotte 22","ra":56.60083333,"simbad_url":"https://simbad.cds.unistra.fr/simbad/sim-id?Ident=M45","source":"sesame","type":"OpC","type_text":"open cluster"},"score":0,"score_astronomy":28,"score_weather":1,"transit":{"airmass":1.05,"alt":72.5,"az":180.1,"t":"2026-09-03T03:20Z"},"verdict":"unusable","weather_known":true,"windows":[{"end":"2026-09-02T21:45Z","end_local":"00:45","hours":4.92,"label":"unusable","mean_quality":0.0,"start":"2026-09-02T16:50Z","start_local":"19:50"},{"end":"2026-09-02T22:00Z","end_local":"01:00","hours":0.25,"label":"poor","mean_quality":0.09,"start":"2026-09-02T21:45Z","start_local":"00:45"},{"end":"2026-09-03T03:50Z","end_local":"06:50","hours":5.83,"label":"unusable","mean_quality":0.0,"start":"2026-09-02T22:00Z","start_local":"01:00"}]}],"unscheduled":[{"name":"M45","why":"Overcast (\u226580 % cloud) for 7.4 of 10.0 dark hours \u2014 the sky is closed whatever the geometry says."}],"warnings":[]}